From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Brake system leverage calculations for foot and hand brakes, using 40° cams and non-wrapping shoes.
Identifier | ExFiles\Box 120\2\ scan0335 | |
Date | 10th June 1938 | |
-6- 10.6.38. cams Using 40°, and non wrapping shoes. Diagram values: 13.925, 4.5, 1.35, 1.725, 1.85, 1.75, 6.5, 4.875, 1.8, 1.8, 2:1, 6.32. Calculation: (13.925 x 1.35 x 1.85 x S x 4.875 x 1.8 x 1 x 2 x 6.32) / (4.5 1.725 1.75 6.5 1.8 1) = 24.2 S 40° Cams = 2.45 = 59.2 : 1 Hand Brake. Calculation: (17 x 1.8 x 1 x 2 x 6.32) / (2.850 1.8) = 75.4 : 1 Diagram values: 17, 2.85, 1.8, 1.8, 2:1, 6.32:1. Ratio Front to Rear 59.2 / 59.2 = 1 : 1 Rm{William Robotham - Chief Engineer}/JBD.{John B. Dixon - Fuel Systems} | ||